Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc954d9597758b7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 05:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5301ad01f865c85a63552d1f05eaf6b SHA-1: 960b3dfdaab3f28e414c8829da30a43aa5b73f16 SHA-256: 3dc954d9597758b7a1fbfe7cebdbee6f21eabd1798829d4543c906417e439cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/uplcv?utm_term=about+mohammed+rafi PDF link annotation
    • http://classicalgardenornaments.com/uplds/file/23283926426.pdfIn PDF document text
    • http://chinahongji.com/d/files/71284566174.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61676618754.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/wajoregefopefulix.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/titimotikezujizojukezu.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/82245551188.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d44e6fa31fd28ca571d69d66bce06198/77669138643.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d467e9e7---80706214657.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607454ef26c1d---6643534271.pdfIn PDF document text
    • http://cjatkinson.com/userimages/jodowa.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/93840594373.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/wefuzifudumekilase.pdfIn PDF document text
    • http://www.toptehnik.si/images/90701685226.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/sudarajapef.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/kufojenufuvalewiganiweg.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f641b8d0a4---petedubo.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608581ac3289b---96841685184.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/8452172401.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/71181652674.pdfIn PDF document text
    • https://coil.hk/upload/files/61926740024.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/kuvuwesewusodexinefaxefa.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0f4ebb2c9---63320304561.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2038f856---dizudekepexi.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/fogez.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 17208 bytes
SHA-256: ad7df561dd982bec61281c661c5eb286e1ef2ca9cc1057444a3814aa9705fb67
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 10520 bytes
SHA-256: 66acdb24f7d8db3b8eda434f41ff078d6e7c10a7e8797322daaaa7a49b21bb8b

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